Motion-picture machine



!. MARKS.

MOTION PICTURE MACHINE.

APPLICATION FILED OCT. 17, 1919.

lPaiented July 6, 1924)..

h Shh *CEE.

TUBING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF CHUSETTS.

MASSA- MOTION-PICTURE MACHINE.

Specification of Letters Patent.

Patented July 6, 19209.,

Application filed October 17, 1919. Serial No. 331,297.

To all whom.- it may c071 (6TH Be it known that I, Isinonn Marks, a c1t1 zen ot' the Vnited States, residing at Dorchester. Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in M0- tion-Picture Machines; and I do hereby dcelare the following to be a full, clear, and exact description of the invention, suclras will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to motlon picture machines and more particularly to such machines for family use in the home generally designated as toys.

The object of the present invention is to improve the construction of such apparatus and increase its eflieiency of operation, with simplicity of parts, cheapness of manutacture and ready adjustaliility. Accordingly an important feature of the invention comprises a novel and GiliiCltllt method ot cooling the light box; and a further denture comprises provision for adjusting the hght, ot whatever size, to the most eiiicicnt position. relative to the reflector and lenses.

To the accomplishment of the above object and such others as may be hereinafterappear, as will readily be HI'Ultl'SlZOOdd'iY those skilled in the art from the Following description, the invention comprises the teatures and (TOHIblIHItiOH of parts hereinatter described and then pointed out in detail in the appended claims.

in the accompanying drawings, showing the preferred form oi the invention. Figure 1 is a side elevation of the complete machine, and is a vertical section. through the center oi the light box, troin front to rear.

in the embodiment of the invcntilm iilus tratixl in the drawings the machine is supported on a base block Wlllifll ma be of wood. and is wanposcd ot two wholly separate parts, naniciy a light box tor and a tilin supporting and tending frame (3.

it will he unneci. to describe in detail the parts carried by the une ti since this portion ot the machine is, in general, simil. to prior machines and not a part oi: the ore nt invention. will s'utiice to say that ,rame (i is channel shaped having a horiszontai shaft journaicd in its side flanges, provided ,with a ranie: one end. and a balance wheel 10 on the other. Gears are provided as shown in Fig. 1 for operating a Geneva stop motion which intermittently advances the usual toothed feed drum carried centrally on the shaft below the projecting lens holder 12. The film used is endless, running over a freely revolving reel 14, sustained on wire supports 16 rising from the frame 6, and then downward through a passage behind the hinged door 18 which holds it in contact with the feed drum.

The features of the present invention relate to improvements in the construction of the light box 4, which, it will be observed, is wholly inclosed and removed from the film carrying frame thus overcoming danger of the heat destroying the film or causing a fire. To further guard against overheating, the box is so constructed as to provide for an efficient circulation of cool air. To this end the light box which, as shown, comprises front and side walls 20 and 22 respectively and a cover Q-i of sheet metal. is provided with a removable or sliding back 26. The cover 24 is shortened, leaving an open ing from side to side at its rear end, and the back is provided with a forwardly curved open ended hood 2? which spans the opening 25. The back also is shortened and does not reach to the base block 52 leaving an opening 1%. The side edges of the back are folded on themselves to embrace outwardlyturncd flanges 23 on then-ear edges of the sides 22 permitting the hack to he slid upwardly on said tlanges and thus removed to gain access to parts within the box. iiithin the tight box is a block 30, secured to the block 2, to which the box is fastened. The

biock 30 is not as long as the light box is deep leaving a space 31 between it and the openii'ig 28. With this construction the cool air will enter the opening 28, be deflected upward by the re: r end of the block 30, and

tinaliy pass out through the space 25, and

open ends of the hood 2?.

The cover 234 .is provided with a central opening 32 through which the socket 333, which carries the buib ii-t is introduced. The socket is provided with a tubular light-wire holding stem which is adjustably secured to a sustaining bell 36 resting on the cover 24 and ciosing the opening 32. The :HljtlStlnient secured through a set screw threaded through a collar 38 carried on the bell. This adjustment is important in regulating the vertical position of bulbs of different sizes relative to the reflector 4:0 and lens 42 secured to the back and front wall, respectively, of the light box.

The nature and scope of the present invention having been indicated and the preferred embodiment thereof having been specifically described, what is claimed as new, is

1. A light box for motion picture machines having front and side walls, a cover shorter than the side walls forming an opening at its rear end, an open ended hood covering said opening and a back having an opening at its lower end.

2. A light box for motion picture machines comprising a base block, walls rising therefrom including a vertically sliding back provided with a forwardly curving hood at its upper end, and a cover the rear weaves edge of which lies just under the forward edge of said hood, said back being of such length as not to reach the base block when its hood contacts with the cover.

3. A.- light-box for motion picture machines comprising front,- side and top walls and a base, the front wall being provided with a light-emitting opening, said top wall terminating short of the rear edge of the box to form a transeversely-extending airexit, a light member inclosed in the box, a back wall provided with a reflector, said back wall being slidably mounted on the side walls and having its top edge bent forwardly and downwardly to meet the upper face of the top wall to thereby form an open-ended hood extending across the top of the box over said air-exit, the bottom edge of said back wall terminating short of the base to thereby provide an air-inlet extending across the rear side of the box.

ISIDORE MARKS. 

